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The warming climate is forcing marathons to consider changes to keep runners cool

Organizers are moving races later or earlier after heat-related cancellations and changes, with one study finding optimal conditions at 46 of 51 U.S. marathons may fade by 2045.

  • Starting in 2027, the Twin Cities Marathon in Minneapolis-St. Paul will shift its more than 40-year tradition of holding the race on the first Sunday in October to later in the month, aiming for cooler conditions.
  • Warming weather is making conditions worse for most marathons, according to a Climate Central study of 221 races, forcing organizers to confront increasingly dangerous conditions caused by climate change.
  • In Los Angeles, warm conditions prompted race organizers to give runners the option of stopping after 18 miles and still receiving a finishers medal, addressing overheating that Paul Grinvalds, who has completed 114 marathons, struggles with above 60 degrees.
  • By 2045, optimal conditions for recreational runners in the low 40s would be less likely at 46 of the 51 U.S. marathons analyzed, as The World Meteorological Organization forecasts global temperatures will rise by more than 1.5 degrees C.
  • University of North Carolina-Chapel Hill researcher Jessica Murfree says organizers of competitions from tennis to college football must increasingly consider changing event dates and times as climate change makes weather hotter and more volatile.
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The warming climate is forcing marathons to consider changes to keep runners cool

Marathon organizers are adjusting to warmer race conditions caused by climate change. Many races are shifting dates, starting earlier or offering shorter runs.

·New York, United States
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Winnipeg Free Press broke the news in Winnipeg, Canada on Thursday, August 13, 2026.
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